Title
Crystal structure of orthorhombic martensite in TiNi-Cu and TiNi-Pd intermetallics Crystal structure of orthorhombic martensite in TiNi-Cu and TiNi-Pd intermetallics
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Les Ulis ,
Subject
Physics
Source (journal)
Journal de physique: 4. - Les Ulis, 1991 - 2006
Source (book)
10th International Conference on Martensitic Transformations, JUN 10-14, 2002, ESPOO, FINLAND
Volume/pages
112(2003) :Part 2 , p. 727-730
ISSN
1155-4339
ISI
000186503400024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The crystal structure of orthorhombic martensite in ternary TiNi-based compounds has been several times examined, although, in all cases, the structure was not completely solved as the positions of atoms in the unit cell remained unknown. In the present work, the X-ray patterns of TiNi-Cu and TiNi-Pd films were refined by the Rietveld method revealing important regularities in the location of Ti and Ni atoms. In particular, the (010) atomic planes in the orthorhombic martensite structure are always distorted and loose the planar centre of symmetry. This observation was confirmed by ab-initio calculations, where the atomic positions were varied in order to minimise the energy of electron bands.
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